而且开发速度大大加快、成本往往较低。
And it does it at a vastly accelerated pace and often at a lower cost.
加快开发速度，并且减少了开发和维护的费用。
Speeds development time and reduces development and maintenance costs.
答案取决于开发速度随代码洁净度变化的曲线。
The answer depends on a kind of response curve of velocity in relation to code cleanness.
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